Saturday 26 February

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 00:32 on Sat 26 Feb to 02:35 on Sun 27 Feb.

   1949-02-25T16:31:41Z → 1949-02-26T18:34:53Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 00:07–00:55 on the 25th, 00:07–00:55 on the 26th.

   nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Caturdaśī must be present during niśītha. It covers 23 of 48 minutes on the 25th and 48 of 48 on the 26th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

4. 04

   Tie-break

   Both nights qualify and the cited authorities disagree. The one covered longer is ruled, as a boundary.

   priority: disputed → greater-coverage · margin 1399 s

5. 05

   Ruling

   Mahāśivarātri, Baoding, 1949: Saturday 26 February.

   confidence: boundary (tie-break-disputed)

Say it like this

In Baoding, Mahāśivarātri 1949 falls on Saturday 26 February. Caturdaśī runs from 00:32 on Sat 26 Feb to 02:35 on Sun 27 Feb and covers all of niśītha that night. It also reaches the previous night for 23 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

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Who says what

Institutional rulings are recorded with a source address, and are never edited to agree.